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NGC 457 is the open cluster highlighted in this image. It is about 7,900 light years away and its age is estimated to be 21 million years. It is known as the Owl cluster, the Number 5 Cluster or the E ...

NGC 7538 is an emission nebula that lies not far from the Bubble Nebula in Cassiopeia, about 9,100 light years away. It has an apparent size of about 8′ x 7′ (the full moon is about 30′ across). NGC ...